Lewis Acids and Bases?

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JustinHorriat_4f
Posts: 111
Joined: Wed Sep 18, 2019 12:19 am

Lewis Acids and Bases?

Postby JustinHorriat_4f » Sun Nov 03, 2019 11:40 pm

Can someone Explain what Lewis Acids and Bases are and why they are an exception to the often rule? Also, what different rxns are they involved in?

IScarvie 1E
Posts: 66
Joined: Sat Aug 17, 2019 12:16 am

Re: Lewis Acids and Bases?

Postby IScarvie 1E » Mon Nov 04, 2019 1:28 am

A Lewis acid is a lone pair acceptor, and a Lewis pair is a lone pair donor. I believe they are similar to covalent bonds, except they typically form as separate molecules and join to fulfill their individual needs

Brittany Tran 3I
Posts: 50
Joined: Sat Jul 20, 2019 12:16 am

Re: Lewis Acids and Bases?

Postby Brittany Tran 3I » Tue Nov 05, 2019 7:38 pm

Lewis acids and bases involve coordinate covalent bonds, in which two atoms share a pair of electrons but both of the electrons come from one atom. Lewis acids are electron pair acceptors and Lewis bases are electron pair donors

Michelle Xie 2B
Posts: 99
Joined: Sat Aug 17, 2019 12:18 am

Re: Lewis Acids and Bases?

Postby Michelle Xie 2B » Fri Nov 08, 2019 12:56 am

A lewis base would donate a pair of electrons and a lewis acid would accept a pair of electrons.

andrewcj 2C
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Re: Lewis Acids and Bases?

Postby andrewcj 2C » Fri Nov 08, 2019 2:15 am

A friend gave me the mnemonic "Lewis has e" which reminds me that Lewis acids and bases focus on electron exchange. After this, I just think about H+, which is acidic, and how it can accept electrons. Therefore, Lewis acids are electron acceptors.

lauraxie2e
Posts: 108
Joined: Fri Aug 09, 2019 12:17 am

Re: Lewis Acids and Bases?

Postby lauraxie2e » Fri Nov 08, 2019 10:16 am

an acid accepts a lone pair and a base gives one up

Nuoya Jiang
Posts: 99
Joined: Sat Sep 14, 2019 12:17 am

Re: Lewis Acids and Bases?

Postby Nuoya Jiang » Fri Nov 08, 2019 10:24 am

Lewis Acids are electron acceptors and Lewis Bases are electron donors.

405335722
Posts: 56
Joined: Fri Aug 30, 2019 12:16 am

Re: Lewis Acids and Bases?

Postby 405335722 » Fri Nov 08, 2019 11:03 am

Michelle Xie 3A wrote:A lewis base would donate a pair of electrons and a lewis acid would accept a pair of electrons.

What is the acid/base name for the definition that says it donates/accepts protons? Is that a Bronsted acid/base?

Madeline Phan 1E
Posts: 103
Joined: Sat Aug 17, 2019 12:18 am

Re: Lewis Acids and Bases?

Postby Madeline Phan 1E » Fri Nov 08, 2019 11:42 am

Lewis acids accept pairs of electrons, while Lewis bases donate entire pairs so they form coordinate covalent bonds since the bases are donating an entire pair of electrons.

Sartaj Bal 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

Re: Lewis Acids and Bases?

Postby Sartaj Bal 1J » Fri Nov 08, 2019 11:47 am

@405335722 the Bronsted-Lowry acid base model states that protons are either accepted or donated.

Eunice Nguyen 4I
Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

Re: Lewis Acids and Bases?

Postby Eunice Nguyen 4I » Fri Nov 08, 2019 12:12 pm

Lewis acid is an electron pair acceptor, while Lewis base donates nonbonding electrons. The bond in which both electrons come from one of the atoms is called a coordinate covalent bond. You can find this information in 2C.3 in the textbook.

MeeraBhagat
Posts: 95
Joined: Sat Aug 24, 2019 12:15 am

Re: Lewis Acids and Bases?

Postby MeeraBhagat » Fri Nov 08, 2019 10:06 pm

Lewis acids accept electron pairs and lewis bases donate that electron pair. The example that Dr. Lavelle used was with BF3 as a lewis acid and F- as a lewis base. Since Fluorine does not make double bonds, and since three fluorines bonded to a boron atom only gives boron 6 valence electrons, the only way for Boron to get an octet is to coordinate covalently bond with a lewis base, F- in this case, which provides both of the electrons needed to complete boron's octet.


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